CareerCup

int numWords (char *string)  {
     int numWords = 0;
     int wordHit = 0;
     for (int i = 0; i < strlen(string); i++) {
          char ch = string[i];
          if (ch == ' ' && wordHit == 1) {
               numWords++;
               wordHit = 0;
          }
          if ((isaplha(ch) || isdigit(ch)) && wordHit == 0) {
               wordHit = 1;
          }
     }
     return numWords;
}

public static int Count(string str)
{
    int wc = 0;
    for (int i = 0; i < str.Length; i++)
    {
         if (str[i] != ' ')
         {
              wc++;
              while (str[++i] != ' ' && i != str.Length - 1);
         }
    }
    return wc;
}

int noOfWords(String s){
if s == null return 0;
while(i<s.length)
{
ifc[i]!=' ' and i==0)
count++;
if(c[i]==' ' and c[i+1]!= ' ')
count++;
return count;
}

private static int numOfWords(String str) {
char[ ] arr = str.toCharArray();
int count = 0;
if(arr[0] != ' ') {
count++;
}
for(int i=1; i<arr.length; i++) {
if(arr[i-1]==' ' && arr[i]!=' ') {
count++;
}
}
return count;
}

int length(char *str){
int count=0;
while (*str !='\0'){
if(*str==' ' && *(str+1)==' '){
str++;
continue;
}else if(*str==' ') count++;
str++;
}
return count;
}

#python code
s = " the quick brown fox jumped  over the   fence  "

word_count = 0
previous_is_blank = True

for c in s:
    if c == ' ':
        previous_is_blank = True
    else:
        if (previous_is_blank):
            word_count += 1
        previous_is_blank = False

print word_count

# include<stdio.h>
# include<conio.h>
# include<stdlib.h>
int find(char *s)
{
int flag=0,count=0;//when flag is made 1 then it means that there are characters in between two white spaces
while(*s!='\0')
{
if(*s==' ')
{
if(flag==1)
{
count++;
flag=0;
}
}//end when white spaces occur
else if(flag==0)//character other than alphabets
flag =1;
s++;
}//end of while loop
if(flag==1)
count++;//for the last word
return count;
}//end of function
int main()
{
char s[100];
int count;
printf("enter the string");
gets(s);
count=find(s);
printf("The number of words present in the string are %d",count);
getch();
return 0;
}//end of main function

one line code in C#

private static int CountWords(string s)
        {
            return s.Split(new[] {' '}, StringSplitOptions.RemoveEmptyEntries).Count();
        }

Similar in Java

1. Trim the string (to remove empty spaces from beginning and at the end)
2. Split using white spaces as a delimiter
3. The length of the array returned in step 2.

#include<stdio.h>
#include<string.h>
#include <conio.h>
int main()
{
    char ch[1000];
    printf("Please Enter the String\n");
    gets(ch);
    int i=0,k=0,j;
    int len=strlen(ch);
    while(ch[i]!='\0')
    {
       if(ch[i]==' '||ch[i]=='\t') {i++;}
        else{
                 while((ch[i++]!=' '&& i<len)&&(ch[i++]!='\t' && i<len));
                  k++;
                 }
    }    
    printf("The number of words is=%d", k);
    getch();
}

public class WordCount {
	public static void main(String[] args) {
		String s = " the quick brown fox jumped  over the   fence  ";
		boolean flag = false;
		int wc = 0;
		for (Character c : s.toCharArray()) {
			if (c == ' ')
				flag = false;
			else if (flag == false && c != ' ') {
				wc++;
				flag = true;
			}
		}
		System.out.println("  " + wc);
	}
}

Is it OK that no one treats other whitespaces (tabs, CR, LF, etc) as non-whitespace or for interview purposes it's presumed that whitespaces are spaces only?